<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>集合</title>
  </head>
  <body>
    <script>
      //声明一个 set
      let s = new Set();
      let s2 = new Set(["大事儿", "小事儿", "好事儿", "坏事儿", "小事儿"]);

      //元素个数
      console.log(s2.size);
      //添加新的元素
      s2.add("喜事儿");
      //删除元素
      //   s2.delete("坏事儿");
      //检测
      console.log(s2.has("糟心事"));
      //清空
      //   s2.clear();
      // console.log(s2);

      for (let v of s2) {
        console.log(v);
      }
    </script>
  </body>
</html>
